Press for treating boards of alkali cellulose and the like



Nov. 6, 1928. 1,690,894

w. DUTZ'MANN PRESS FOR TREATING BOARDS OF ALKALI CELLULOSE AND THE LIKE Filed Feb. 27, 1926 2 Sheets-Sheet m zz, H g

Nov.6, 1928.

w. DUTZMANN' PRESS FOR TREATING BOARDS OF ALKALI CELLULOSE AND THE LIKE 2 Sheets-Sheet 2 i h 8 EM llll m. 1 m d i l y filler/25 Patented Nov. 6, 1928.

UNITED STATES "PATENT OFFICE.

WILHELM DllTZMANN, OF NEUSTADT-ON-THE-HAARDT, GERMANY.

PRESS FOR TREATING BOARDS OF ALKALI CELLULOSE AND THE LIKE.

Application filed February'27, 1926, Serial No. 91,161, and in Germany January 2, 1926.

My invention relates to presses for treat-- ing sheets or boards of alkaline cellulose or the like of such type as described in my prior application (Serial X0. 68,907, filed November 13, 1925). The novel feature of this invention consists in having metal sheets divided along the whole length of an unperforated or water-tight trough, carrying in its interior a perforated bottom, which is composed of a main part and a secondary part, being flush with the mainone andfo-rming the bottom of a chest or basket adapted to be removed from the saidtrough,whenthe celluloseboards are pressed out and slid along the said perforated bottom into the said basket; in this way there is no necessity for the worker of bringing his hands in contact with the boards and the corrosive alkali solution when discharging the trough after the treating process.

My additional invention has the object of considerably simplifying the construction of the press and its operation,

By my new invention with a minimum of i'nanipulations the process of treating the raw material is carried out in the least possible time by a very small number of workers. It is a further object of my invention to press under the highest tolerable pressure without endangering the safety of the different parts of the machine, because all stresses or forcing actions are removed, which could not have been foreseen and contemplated.

My invention consists in the construction and arrangement of the press and its parts as hereinafter described and illustrated.

In the accompanying drawings, Fig. 1 is a longitudinal section of the material part of the press embodying my invention. Fig. 2 is a sectional plan view. Figs. 3 and 4 show on an enlarged scale a section and a sectional plan view respectively-of some important details of my press;

Like parts are designated by similar letters of reference in the several views.

a designates the steeping trough, as it is known and 2 the pressing head, horizontally guided to the left and right hand. The plunger 3 passes water-tight through a packing in front wall 4, in'the immediate proximity of which the tubing joints 5 and 6 are arranged for feeding in and discharging respectively the alkali solution. Atthe opposite end of the trough according to the invention witha in the bottom a a shutting member .is ar ranged; the same is formed by a closing-flap adapted to turn about the horizontally arranged pivots or points 6; the flap c is adapt ed to engage in water-tight relation with the locking frame (Z, carrying a packing (Z and rigidly and tightly attached to the bottom part a of the trough. Two tension-rods 16 carrying a locking-bar 7 serve for tight-1y pressing on the flap, three hook-shaped arms, rigidly fastened to the flap and adapted to engage with said locking-bar 7. The tensionrods 16 can be shifted up and down by means of a. helical gear 17 Curved guidance 9, rigidly fixed to the pressing counter-bearing e is provided, to swing out, when moved downwardly, the tension-rods 16 together with the locking bar in the direction of the arrow ac. thus releasing the hooked arms 12 and enabling the closing flap c to beopened in the direction as indicated by the arrow 01. The

tension-rods swung out are designated by 16;

counter-weights f tend to hold the locking flap 0 in its horizontal position, thus only a small force is applied to open the flap and free the bottom aperture.

In the interior of the stee'ping trough as it is known, lateral guiding bars a are arranged for guidingintermediate sheet-s connected with each other. and with the pressing head 2 respectively by means of chains h or the like.

Immediately below the lower edge of the intermediate sheets 9, a perforated intermediate bottom 2' is arranged upon which the cellulose boards are based, laterally supported by the said intermediate sheets. bottom 2' finds its continuation by a. separate sectional bottom part i arranged above the locking flap 0 and rigidly connected with the latter.

The operation of the new press takes place as follows: After pressing out the cellulose boards and discharging the lye, the locking bar 7 is released and the shutting flap opened by slightly lifting the counter-weight f and turning the flap in the direction of the arrow :12. During this time the pressing piston 2 holds fast the cellulose boards. withdrawing slightly the pressing piston the boards forced out. fall downwardly through the aperture of the trough bottom a into a feeding car 70, whereas the sheets bear surely upon their guiding bars (1 By again shifting forward the pressingpiston 2, the other cellulose boards contained within the trough are also discharged through the bottomopening.

It will be observed from the foregoing de- The intermediate loo scription, that the steeping, squeezing out and the Whole treatment of the cellulose boards is carried out in an extremely simple manner without danger, of any contact of 5 the worker with. the lye.

It is Obvious, that the construction and ar rangement of the shutting member at the bOttom of the'trough is by no means limited to the mode of execution as illustrated; instead of a flap,"-'a slide could be used or instead of a flap showing only one Wing, a door consisting of two wings is capable of being used; furthermore the means to press on the locking member can be varied'in different Ways over the constructional form described.

Having now particularly described and ascertained the nature of my invention, what I claim is:

1., Horizontal press for treating articles in alkalies and acids having corrosive properties, more especially boards of alkali cellulose for the manufacture of artificial silk comprising in combination with a horizontal press cylinder, pistonrod and pressing head, a water-tight steeping trough receiving the pressing head and pistonrod, the latter passingWater-tight through the corresponding front Wall of the trough, the opposite 'stationary frontwall of the latter receiving the full pressure of the pressin head, a perforated intermediate bottom within the trough, a discharging opening provided for in the bottom of the trough, a shutting flap adapted to close tight to liquid the said opening, intermediate metal sheets for separating and supporting the difierent boards, guiding bars for-the intermediate sheets and means for tightening the flap, substantially as described.

2. Horizontal press for treating articles in alkalies and acids having corrosive properties, more especially boards of alkali cellulose for the manufacture of artificial silk comprising in combination with a horizontal press cylinder, pistonrod and pressing head, a water-tight steeping trough receiving the pressing head and pistonrod, the latter passing Water-tight trough the corresponding front wall and the trough, the opposite stationary front wall of the latter receiving the full pressure of the pressing head, a discharging opening in the bottom of the trough at one end, a locking flap for the said opening, pivotally arranged o'n'the trough, an intermediate perforated bottom, having a separate sectional part attached to the flap above the said opening, means for closing the flap, in- -termediate sheets for separating and supporting the said boards, guiding bars for the said intermediate sheets and means for operating the flap, substantially as described.

'3. Horizontal press for treating articles in alkalies and acids havin corrosive properties, more especially boar s of alkali cellulose for the manufacture of artificial silk comprising in combination with a horizontal press cylinder, pistonrod and pressing head, a Water-tight steeping trough receiving the pressing head'and pistonrod, a discharging opening in the bottom ofthe trough, a locking member for closing tight to liquid the said-discharging opening and means for operating the locking member.

In testimony whereof, I have signed my name to this specification at Frankfort-onthe-Main, this 9th day of February, 1926.

WILHELM DUTZMANN. 

